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r. <br /> 2.4 Estimates of liquid quantity and composition leaked: <br /> No estimate of liquid quantity can be made with existing informa- <br /> tion. The constituents detected in the soil samples are typical- <br /> ly derived from gasoline. <br /> 2.5 Topography, geology, surface water, depth to groundwater: <br /> The site is situated on level terrain comprised =a QuaternamatelY ry-- <br /> Recent alluvial sediments. Depth to water is app <br /> 25 feet below grade based on the San Joaquin Flood Control and <br /> Water Conservation Dislly flows <br /> i STs data. Regional <br /> west snort west parallelter <br /> o <br /> (unconfined) generally <br /> the nearby Stockton Deep Water Channel. <br /> 2.6 Proximity of private, municipal and irrigation wells: <br /> Data on wells within one half mile of the project e provided <br /> by the Department of Water Resources (DWR) are plotted <br /> n Figure <br /> 3. <br /> 3.0 INVESTIGATIVE METHODS AND PROCEDURES <br /> 3.1 Well Installation <br /> On September 10 and 11, 1990 two soil borings were drilled near <br /> tank pit A, and one soil boring was drilled groundwater moniear tank pit B <br /> ( Figure 2), all three borings were completed <br /> leted at a depth o£ 45 feet <br /> toning wells. These wells were comp <br /> below grade. Two additional 21.5 foot soil borings were also <br /> located adjacent to tank pit A. On January 3 and 4, 1991, four <br /> C <br /> as monitoring wells to <br /> additional sail borings were <br /> further identify and define the extent of petroleum hydrocarbon <br /> concentrations in groundwater. All four monitoring wells in- <br /> stalled in January were completed at a depth of 45' below grade. <br /> Two of the wells were drilled near each of the farmer tank pits <br /> (A and B). Drilling was conducted by Spectrum Exploration under <br /> C57 licanse no. 512268 using a hallow stem auger rig. The boring <br /> and well locations are plotted on Figure 2. =ehe/casing wells wand <br /> constructed of two inch diameter F480 PVC <br /> sencompleted as shown on Figure 4. <br /> 3.2 Soil Sampling <br /> Drill cuttings were logged continuously for characterization of <br /> contamination and soil type <br /> DescriptionsloffiesoilsoiencounteredLand <br /> ion <br /> System (Appendix I ) . <br /> lonstaandgarelcontainedcinoAppendixswere II. soilosamples boring/well <br /> wel werecol <br /> g <br /> 2 <br />